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快离子导体的离子电导率很高(大于1×10~(-3)Ω~(-1)·cm~(-1)),电子电导率很低(小于总电导率的1％)。它的一个重要应用是作固体电池的电解质隔膜。已知的离子导体不下千种,而快离子导体却为数甚少,锂的快离子导体则几乎尚未发现。从研制高能量密度电池的角度考虑,锂的快离子导体是关键材料,这是近几年来对探索锂的快离子导体给予极大重视的原因。在锂型快离子导体中,Li_3N是研究得最多的材料,室温下多晶片的离子电导率为6.6×10~(-4)Ω~1·cm~(-1)(B.A.Boukamp and R.A.Huggins,1978),但分解电压太低(～0.45V),稳定性差,不可能在电池中应用它。Li_(3.3)Si_(0.3)V_(0.7)O_4是一种较好的锂离
Fast ionic conductors have high ionic conductivities (greater than 1 × 10 -3 Ω -1 cm -1) and low electron conductivity (less than 1% of total conductivity). It is an important application for solid electrolyte battery separator. Known ionic conductor is not less than a thousand species, while the number of fast ion conductors is very small, fast lithium ion conductor is almost not yet found. From the perspective of the development of high-energy density batteries, lithium fast ion conductor is the key material, which is in recent years to explore lithium fast ion conductor to give great importance reason. Li3N is the most studied material in the lithium fast ionic conductor. The ionic conductivity of polycrystalline wafers is 6.6 × 10 -4 Ω -1 · cm -1 at room temperature (BABoukamp and RA Huggins, 1978), but the decomposition voltage is too low (~ 0.45V), poor stability, it is impossible to apply it in the battery. Li_ (3.3) Si_ (0.3) V_ (0.7) O_4 is a better lithium ion